package com.itheima.reggie.controller;


import com.baomidou.mybatisplus.core.conditions.query.LambdaQueryWrapper;
import com.itheima.reggie.common.BaseContext;
import com.itheima.reggie.common.R;
import com.itheima.reggie.entity.ShoppingCart;
import com.itheima.reggie.service.ShoppingCartService;
import lombok.extern.slf4j.Slf4j;
import org.apache.ibatis.annotations.Delete;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.web.bind.annotation.*;

import java.time.LocalDateTime;
import java.util.List;

@RestController
@RequestMapping("/shoppingCart")
@Slf4j
public class ShoppingCartController {
    @Autowired
    private ShoppingCartService shoppingCartService;

    /**
     * 添加购物车
     * @param shoppingCart
     * @return
     */
    @PostMapping("/add")
    public R<ShoppingCart> add(@RequestBody ShoppingCart shoppingCart){
        log.info("购物车信息:{}",shoppingCart);
//        A. 获取当前登录用户，为购物车对象赋值
        Long currentId = BaseContext.getCurrentId();
        shoppingCart.setUserId(currentId);

//        B. 根据当前登录用户ID 及 本次添加的菜品ID/套餐ID，查询购物车数据是否存在
        Long dishId = shoppingCart.getDishId();
        LambdaQueryWrapper<ShoppingCart> wrapper = new LambdaQueryWrapper<>();
        wrapper.eq(ShoppingCart ::getUserId,currentId);

        if (dishId != null) {
            //添加购物车的为菜品
            wrapper.eq(ShoppingCart :: getDishId,dishId );
        }else {
            //添加购物车的为套餐
            wrapper.eq(ShoppingCart ::getSetmealId,shoppingCart.getSetmealId() );
        }
        //查询当前菜品或者套餐是否在购物车中
        ShoppingCart cartServiceOne = shoppingCartService.getOne(wrapper);
//        C. 如果已经存在，就在原来数量基础上加1
        if (cartServiceOne != null) {
            Integer number = cartServiceOne.getNumber();
            cartServiceOne.setNumber(number + 1);
            shoppingCartService.updateById(cartServiceOne);
        }else {
//           D. 如果不存在，则添加到购物车，数量默认就是1
            shoppingCart.setNumber(1);
            shoppingCart.setCreateTime(LocalDateTime.now());
            shoppingCartService.save(shoppingCart);
            cartServiceOne = shoppingCart;
        }
        return  R.success(cartServiceOne);
    }
    /**
     * 查看购物车
     * @return
     */
    @GetMapping("/list")
    public R<List<ShoppingCart>> list(){
        log.info("查看购物车...");

        LambdaQueryWrapper<ShoppingCart> queryWrapper = new LambdaQueryWrapper<>();
        queryWrapper.eq(ShoppingCart::getUserId,BaseContext.getCurrentId());
        queryWrapper.orderByAsc(ShoppingCart::getCreateTime);

        List<ShoppingCart> list = shoppingCartService.list(queryWrapper);

        return R.success(list);
    }

    /**
     * 清空购物车
     * @return
     */
    @DeleteMapping("clean")
    public R<String> clean(){
        //获取当前登录用户，根据登录用户ID，删除购物车数据。
        LambdaQueryWrapper<ShoppingCart> wrapper = new LambdaQueryWrapper<>();
        wrapper.eq(ShoppingCart ::getUserId,BaseContext.getCurrentId());
        shoppingCartService.remove(wrapper);
        return R.success("清空成功");
    }

    /*@PostMapping("/sub")
    public R<String> sub(){
        LambdaQueryWrapper<ShoppingCart> wrapper = new LambdaQueryWrapper<>();
        wrapper.eq(ShoppingCart ::getUserId,BaseContext.getCurrentId() );

    }*/
}
